F15B 11/006
Hydraulic "wheatstone bridge" circuits, i.e. with four nodes, p-a-t-b, and on-off or
Official title: {Hydraulic "Wheatstone bridge" circuits, i.e. with four nodes, P-A-T-B, and on-off or proportional valves in each link}
F15B11/006 (Hydraulic "wheatstone bridge" circuits, i.e. with four nodes, p-a-t-b, and on-off or) appears on 172 US grants and 172 published applications in this corpus.
Search patents in F15B- Granted patents
- 172
- Published applications
- 172
- Assignees
- 82
- Inventors
- 310
- Latest grant
- 17 Mar 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 1 | 0 |
| 1977 | 0 | 0 |
| 1978 | 1 | 0 |
| 1979 | 0 | 0 |
| 1980 | 0 | 0 |
| 1981 | 1 | 0 |
| 1982 | 1 | 0 |
| 1983 | 0 | 0 |
| 1984 | 1 | 0 |
| 1985 | 1 | 0 |
| 1986 | 0 | 0 |
| 1987 | 2 | 0 |
| 1988 | 3 | 0 |
| 1989 | 2 | 0 |
| 1990 | 0 | 0 |
| 1991 | 1 | 0 |
| 1992 | 2 | 0 |
| 1993 | 1 | 0 |
| 1994 | 1 | 0 |
| 1995 | 0 | 0 |
| 1996 | 0 | 0 |
| 1997 | 0 | 0 |
| 1998 | 0 | 0 |
| 1999 | 5 | 0 |
| 2000 | 2 | 0 |
| 2001 | 4 | 1 |
| 2002 | 6 | 4 |
| 2003 | 7 | 11 |
| 2004 | 14 | 14 |
| 2005 | 7 | 9 |
| 2006 | 5 | 11 |
| 2007 | 13 | 14 |
| 2008 | 10 | 14 |
| 2009 | 5 | 6 |
| 2010 | 7 | 9 |
| 2011 | 6 | 4 |
| 2012 | 6 | 5 |
| 2013 | 3 | 6 |
| 2014 | 3 | 8 |
| 2015 | 1 | 10 |
| 2016 | 9 | 5 |
| 2017 | 6 | 5 |
| 2018 | 3 | 7 |
| 2019 | 7 | 8 |
| 2020 | 9 | 1 |
| 2021 | 6 | 7 |
| 2022 | 2 | 1 |
| 2023 | 2 | 4 |
| 2024 | 3 | 2 |
| 2025 | 0 | 3 |
| 2026 | 3 | 3 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Recent patents
- Method of forming a quadrant control valve system, quadrant control valve system and hydraulic system17 Mar 2026US 12,577,970 B2HAWE Hydraulik SE
- Method for operating a fluid system and fluid system3 Feb 2026US 12,540,684 B2Festo AG & Co.
- Pneumatic system and process27 Jan 2026US 12,535,089 B2Festo AG & Co.
- Pneumatic cylinder system26 Nov 2024US 12,152,616 B2Staccato Technologies AB
- Pivot joint19 Nov 2024US 12,145,265 B2Festo AG & Co.
- Fluid control assembly and system16 Jul 2026US 2026/0201971 A9Precision Planting LLC
- Valve system and method for operating a pneumatic actuator12 Feb 2026US 2026/0043423 A1Festo AG & Co.
- Method of forming a quadrant control valve system, quadrant control valve system and hydraulic system1 Jan 2026US 2026/0002554 A1HAWE Hydraulik SE
- Method for operating a fluid system and fluid system15 May 2025US 2025/0155044 A1Festo AG & Co.
- Modulator for generating a pressure change, pneumatic vehicle system, commercial vehicle, and method for controlling a pneumatic pressure in a pneumatic load by open-loop or closed-loop control6 Mar 2025US 2025/0075711 A1
Most cited
By later US patents
- Hydraulic system with cross function regeneration90US 6,502,393 B1HUSCO International, Inc. · 2003
- Hydraulic circuit with a return line metering valve and method of operation81US 6,467,264 B1HUSCO International, Inc. · 2002
- System and method for controlling an independent metering valve77US 5,960,695 ACaterpillar Inc. · 1999
- Electrohydraulic valve system54US 4,437,385 ADeere & Company · 1984
- System and method for accumulating hydraulic fluid48US 6,655,136 B2Caterpillar Inc. · 2003